The findings, if confirmed in future studies, could lead to a role for vitamin D supplementation in preventing this serious autoimmune disease in adults. The study was published online February 3, 2013 and will appear in the March 1 print edition of the American Journal of Epidemiology.
"It is surprising that a serious disease such as type 1 diabetes could perhaps be prevented by a simple and safe intervention," said lead author Kassandra Munger, research associate in the Department of Nutrition at HSPH.
This study provides the strongest findings to date to suggest that vitamin D may be protective against type 1 diabetes.
In type 1 diabetes (once called juvenile-onset or insulin-dependent diabetes), the body's immune system attacks and permanently disables the insulin-making cells in the pancreas. About 5% of the estimated 25.8 million people in the United States with diabetes have type 1, according to the American Diabetes Association. Although it often starts in childhood, about 60% of type 1 diabetes cases occur after age 20.
Previous studies have suggested that a shortage of vitamin D might boost type 1 diabetes risk, although those studies mostly examined the link between vitamin D levels in pregnancy or childhood and the risk of type 1 diabetes in children. Other research, in young adults, uncovered an association between high vitamin D levels and a lowered risk of multiple sclerosis—an autoimmune disease genetically and epidemiologically related to type 1 diabetes—suggesting that inadequate vitamin D in adulthood may be an important risk factor for autoimmune diseases in general.
Long-term study of military personnel
The researchers conducted a prospective case-control study of U.S. military personnel on active duty, using blood samples from the Department of Defense Serum Repository, which contains more than 40 million samples collected from 8 million military personnel since the mid-1980s. Identifying 310 individuals diagnosed with type 1 diabetes between 1997 and 2009, the team examined blood samples taken before onset of the disease, and compared the samples with those of 613 people in a control group.The researchers found that white, non-Hispanic, healthy young adults with higher serum levels (>75 nmol/L) of vitamin D had about half the risk of developing type 1 diabetes than those with the lowest levels of vitamin D (
"The risk of type 1 diabetes appears to be increased even at vitamin D levels that are commonly regarded as normal, suggesting that a substantial proportion of the population could benefit from increased vitamin D intake," said Alberto Ascherio, professor of epidemiology and nutrition at HSPH, the study's senior author.
About vitamin D
Worldwide, an estimated 1 billion people have inadequate levels of vitamin D in their blood, and deficiencies can be found in all ethnicities and age groups. While sun exposure is an excellent source of vitamin D, sunscreen, clothing, skin pigmentation, and winter months reduce vitamin D production. Food tends to be a poor source of vitamin D, with "good" sources, such as salmon and fortified milk, containing 400IU or less per serving. "Whereas it is premature to recommend universal use of vitamin D supplements for prevention of type 1 diabetes, the possibility that many cases could be prevented by supplementation with 1,000-4,000 IU/day, which is largely considered safe, is enticing," the authors said.
This study was funded by the National Institute of Neurological Disorders and Stroke (grant NS046635).
"Preclinical Serum 25-Hydroxyvitamin D Levels and Risk of Type 1 Diabetes in a Cohort of U.S. Military Personnel," Kassandra L. Munger, Lynn I. Levin, Jennifer Massa, Ronald Horst, Tihamer Orban, and Alberto Ascherio, American Journal of Epidemiology: online February 3, 2013; March 1, 2013 print edition.
Visit the HSPH website for the latest news, press releases, and multimedia offerings.
Harvard School of Public Health is dedicated to advancing the public's health through learning, discovery, and communication. More than 400 faculty members are engaged in teaching and training the 1,000-plus student body in a broad spectrum of disciplines crucial to the health and well being of individuals and populations around the world. Programs and projects range from the molecular biology of AIDS vaccines to the epidemiology of cancer; from risk analysis to violence prevention; from maternal and children's health to quality of care measurement; from health care management to international health and human rights. For more information on the school visit: http://www.hsph.harvard.edu
HSPH on Twitter: http://twitter.com/HarvardHSPH
HSPH on Facebook: http://www.facebook.com/harvardpublichealth
HSPH on You Tube: http://www.youtube.com/user/HarvardPublicHealth
HSPH home page: http://www.hsph.harvard.edu
Marge Dwyer | EurekAlert!
Understanding the Body’s Response to Worms and Allergies
24.04.2015 | University of Manchester
Caring for blindness: A new protein in sight?
22.04.2015 | NSERM (Institut national de la santé et de la recherche médicale)
Siemens hat einen einzigartigen Elektromotor entwickelt, der hohe Leistung mit einem minimalen Gewicht kombiniert. Durch konsequente Optimierung aller Komponenten stellt der neue Antrieb in seiner Klasse einen Weltrekord beim Leistungsgewicht auf. Dadurch kommt der routinemäßige Einsatz von elektrisch angetriebenen Flugzeugen oder Helikoptern einen großen Schritt näher.
Manchmal lässt sich eine technische Revolution ganz knapp in einer einzigen Zahl zusammenfassen. In diesem Fall lautet sie: fünf Kilowatt pro Kilogramm – das...
KAIST researchers published an article on the development of a novel technique to precisely track the 3-D positions of optically-trapped particles having complicated geometry in high speed in the April 2015 issue of Optica.
Daejeon, Republic of Korea, April 23, 2015--Optical tweezers have been used as an invaluable tool for exerting micro-scale force on microscopic particles and...
Ein Team von Astronomen unter der Leitung von Ivan Minchev, Wissenschaftler am Leibniz-Institut für Astrophysik Potsdam (AIP), hat mithilfe hochmoderner theoretischer Modelle das Rätsel um die Entwicklung der Galaxienscheiben gelöst. Die jetzt veröffentlichte Studie zeigt, dass sich Sternpopulationen gleichen Alters durch Galaxienkollisionen nach außen hin ausweiten. Ähnlich wie die Blüten einer Rose reichern sich diese Populationen schichtweise in der Galaxie an und formen so allmählich die dicke Scheibe.
„Wir können nun zum ersten Mal zeigen, dass dicke Scheiben nicht nur aus alten Sterngenerationen bestehen, sondern – in einem größeren Abstand zum...
A very small and rare species of shark is swimming its way through scientific literature. But don't worry, the chances of this inches-long vertebrate biting...
Morbus Crohn zählt zu den chronisch-entzündlichen Darmerkrankungen (CED). Bei der Krankheit spielt die genetische Veranlagung eine Rolle - und offenbar auch...
24.04.2015 | Veranstaltungen
24.04.2015 | Veranstaltungen
24.04.2015 | Veranstaltungen
24.04.2015 | Informationstechnologie
24.04.2015 | Energie und Elektrotechnik
24.04.2015 | Messenachrichten